Slag blocking ball for converter

Abstract

The invention discloses a slag blocking ball for a converter. The slag blocking ball comprises a ball matrix (1) and a handle (3), wherein the handle is connected with the ball matrix; the surface of the ball matrix (1) is coated with a gas generating layer (2), which is 10cm to 20cm thick, in an enwrapping manner. According to the slag blocking ball for the converter, by adopting a method of coating the surface of the ball matrix of the slag blocking ball with a circle of substance which can generate gas at a high temperature, the effects of decreasing the occurrence rate of the stranding phenomenon of the slag blocking ball and suppressing the phenomenon that slag is entrapped by a tapping vortex are achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular, the invention relates to a slag blocking ball for a converter. Background technique [0002] Too much slag in the converter will adversely affect the subsequent molten steel refining and the quality of the steel, which will lead to phenomena such as phosphorus recovery in molten steel, slow slag formation from refining white slag, and excessive inclusions in molten steel. At present, the slag blocking methods in the process of discharging steel in converters include sliding tapping hole blocking, throwing blocking ball, throwing blocking cone, throwing blocking rod, pneumatic blocking, etc. Among them, the most widely used blocking method is The slag method is to block the slag by sliding the tapping hole and throwing the slag blocking ball. The sliding tapping hole is used to block the slag in large and medium-sized converters. The slag blocking at the sliding ta...

AI Technical Summary

Problems solved by technology

[0002] Too much slag in the converter will have adverse effects on the subsequent refining of molten steel and the quality of steel products, and will cause the phenomenon of phosphorus reversion in molten steel, slow slag formation of refining white slag, and excessive inclusions in molten steel.

At present, the slag blocking methods in the process of putting steel into the converter include sliding taphole slag blocking, throwing slag blocking balls, throwing slag blocking cones, throwing slag blocking rods, and pneumatic slag blocking, among which the most widely used The slag method is sliding taphole slag blocking and throwing slag blocking balls. Sliding tapping hole slag blocking is applied to large and medium-sized converters. The sliding tapping hole slag blocking adopts infrared slag recognition technology. When slag injection is detected, And when the percentage of slag content set by the system is exceeded, the computer system will give the sliding plate closing action signal at this time, and the sliding tapping hole will be closed by the hydraulic system. Although the sliding tapping hole slag blocking technology can greatly reduce the amount of slag , but it is impossible to suppress the eddy current slag entrainment during the tapping process. In order to increase the amount of steel tapping, at the end of tapping, although it is known that the molten steel vortex will entangle the converter slag into the ladle, it is necessary to wait until the molten steel is exhausted before closing the slide Tapping hole; the density of the slag blocking ball and the slag blocking plug is between the molten steel and the slag. The slag stopper is often stranded and cannot be accurately flushed into the tapping hole. The hit rate of the slag stopper is low, about 80%, and the slag stopper and the slag stopper cannot suppress the eddy current slag entrainment during the tapping process.

At present, the method of interfering with eddy current slag entrainment is to install a gas injection device such as a breathable brick at the bottom of the furnace near the tapping hole to inject gas into the furnace or extend the gas injection pipe into the converter for gas injection to inhibit Eddy current or the effect of blowing away the slag, but more complicated equipment needs to be installed, and the cost of equipment installation and maintenance is higher

Images